Window fan



FIG. 1 is a drawing showing a perspective view, taken from the front, right side, and top, illustrating my new design of a window fan;

FIG. 2 is a drawing illustrating a perspective view taken from the rear, right side, and top thereof;

FIG. 3 is a drawing illustrating a front elevation view thereof;

FIG. 4 is a drawing illustrating a rear elevation view thereof;

FIG. 5 is a drawing illustrating a left side elevation view thereof;

FIG. 6 is a drawing illustrating a right side elevation view thereof;

FIG. 7 is a drawing illustrating a top plan view thereof; and,

FIG. 8 is a drawing illustrating a bottom plan view thereof. 

The ornamental design for a window fan, as shown and described. 